At least three bombs exploded near Cairo University today. The attacks, which killed at least one police officer, wounded about half a dozen people. According to press reports, the first two bombs detonated almost simultaneously, and the third went off nearly two hours later.

According to Al Ahram, authorities have detained at least 15 students for questioning. Egypt’s Interior Minister identified the slain policeman as Brigadier General Tarek al Mergawi. Authorities ordered the evacuation of the campus following the bombings, Aswat Masriya reported.

Today’s bombings have thus far gone unclaimed. Last week, Egypt’s Foreign Ministry said that 496 people, mostly security personnel, have been killed in militant attacks since July 2013.